Spinning frame



April 16, 1957 H. BADE 2,788,631

SPINNING FRAME Filed March so, 1953 illlUlll @United States Pate SPINNING FRAME Applicat ion March, 1953, Serial N 0. $45,363 llaims priority, ap plication- Germany April 9,1952 5. Claims; (Ci. '7-'--36) The invention relates to a spinning frame for bast fibres. orlo'ng' leaf fibres, particularly jute.

The known machines of this kind are provided with a pair of feed rollers and a pair of delivery rollers, between which a device is arranged for guiding and supporting the sliver or fibre hand during the drawing operation, while the bobbin is provided after the pair of delivery rollers. The pair of delivery rollers must not only'stretch the sliver in co-operation with the pair of feed rollers and the. intermediate guiding and supporting device, but also form the holding or gripping'point for the sliver, in order to. obtain the twisting of the fibres in co-operation with the flyer and the bobbin. For this purpose, a conductor or a thread guide is arranged in known devices directly in front of the pair of delivery rollers, which has the object of collecting the sliver together in the transverse direction, so that it is passed with a substantially circular cross-section through the pair of delivery rollers.

The known devices of this kind operate readily so long as only moderate degrees of drawingor. stretching are required from the drawing device arranged on the spinning frame, which device comprises the pair of feed rollers and the pair of delivery rollers in combination with the supporting and guiding device located between them. In order to be able to spin finer yarns, the arrangement of a third drawing frame and a roving frame is necessary.

Should measures be taken to increase the degree of drawing within the spinning frame, difiiculties arise in the known devices which considerably lower the extent of the drawing effect.

Therefore one object of the invention is to improve the efficiency of the drawing efiect in spinning machines.

Another object lies in simplifying the drawing and spinning of bast fibres or long leaf fibres, particularly jute.

A further object of the invention resides in spinning a fine yarn without making use of a rovingframe.

Still another object of the invention is to decrease the number of separate stretching devices arranged, before the spinning machine.

According to the invention there are arranged, between the pair of delivery rollers and the bobbin, a furtherpair of rollers (twisting rollers), which are made to rotate at approximately the same circumferential velocity as the pair of delivery rollers. In this way, the operation of drawing or stretching and the operation of holding the sliver for the purpose of twisting are divided between two pairs of rollers. The sliver can then be drawn or stretched to a substantially greater degree without giving rise to any driving difiiculties or damaging the quality of the drawing effect.

For further improvement of the invention, the conductor or thread guide is no longer provided directly in front ofthe pair of delivery rollers, but between the pair of delivery rollers and the pairs of twisting rollers, so that the sliver with very short staple lengths is taken and held almost-up to the delivery rollers and is only colthe degree of stretching.

lected together in the'transversedirection after the-draw ingoperation has. been finished. The; drawing; is substantially improved thereby and the stretching work is decreased. In the known -devices,;the-drawing or'stretching operation has been impaired by the-fact; that: the. sliver, whilst it was still being stretched was. collectedtogether in the transverse direction by the-thread guide or. conductor. In contrastto this, in: accordance to the: invern tion, thesliver isguided through the pair of delivery rollers at its full width and is only thencollectedtogether transversely after having been made easier. according to It, has: been foundthat the progress. in the drawing; ofv the sliver obtainedinthis way is. considerable andv that the stretching willbe possible;v to a considerably greater extent-than, that previously obtainable in spinningframes.

- It is recommendable for improving the inventionto arrange a devicedriven. from the driven feed roller between the pairs of feed and delivery rollers for guiding and supporting the sliver duringdrawing thereof andto connect the. driven feedroller with its: driving shaft by means of. a coupling, which can: be disengaged by means of a thread-feeler lever on thread breakage behindthe pair of twisting rollers; In. this way, the possibility of obtaininga particularly extensive stretching or drawing in the spinning frame. is considerably increased. It has been-found. that inthis; way a third-drawingframez or a roving frame can be. safelydispensed' with, without the possibility of spinning, fine yarns on the. spinningframe being preiudiced- The provision. of: the second drawing frame itself can even: be dispensedwithunder certain circumstances in this manner.

Further improvements. and desirable constructions of the invention are described with reference to the accompanying drawing, in which;

Fig. 1 shows aside view ofthe parts of av jute spinnin frame. being essential for the. invention;

Fig. 2 shows a front view of the machine of Fig. 1.

In the embodiment described, two adjacently lying drawing or stretching devicesare always combined in one unit, such that each single bearing block comprises the bearing device for receiving the drawing mechanism for the two spinning units; Such a combination is not, however, of essential importance for, carrying out the invention.

Two driven feed rollers 2' are arranged on a continuously revolving driving shaft 1,. which rollers 2 are each capable of being coupled by a.v coupling (not shown in detail) with the driving shaft 1. Anabutment ring 3 with grooves 4-distributed over the surface thereof serves for controlling the coupling, and pawl 5 which is rotatably arranged on a pin 6 inthe bearing block 7- co operates with such grooves 4. The construction of the coupling itself is not shown in detail since it is not essential for understanding the invention. Each of the feedrollers 2 is provided with a spur gear 55, for a purpose to be described in greater detail below. A sliver guide 8 is rigidly arranged in front of each feed roller 2 which guides the sliver, for example, from a can to the feed rollers.

A feed roller 9 co-acts with-the driven feed'roller, which roller 9 is rotatably journalled' on a bell crank lever with two arms 10, 11. Whereas the arm 10' is rotatably journal'led on a bearing blocklZ, a spring 13 acts'on the arm 11, which spring 13 abuts a part rigidly. connected with the machine frame.

A driven deiivery roller 14-is.secured.;to a-continuously revolving delivery roller; shaft 15 and-co-operates with a pressure roller 16.which. is. spring urged by: means ofa spring. 17 against the dri'vendeliyery roller 14. Behind the pair of: delivery rollers, a whorl with flyers isarranged in known manner, from which the yarn is wound on to a bobbin. On account of simplicity, only one whorl 18 with one flyer 19 is shown under which are located the bobbins which are rotatably iournalled on a bobbin frame. A pair of twisting rollers 20, 21 are, in accordance with the invention, arranged between the whorl and the pair of delivery rollers. Whereas the roller 20 is secured to a driving shaft, the-roller 21 is pressed against the roller 20 by means of the spring 17-, which in the embodiment is used simultaneously for pressing the pressure roller '16 against the driven delivery roller 14. The shaft of the twisting roller 20 is driven at about the same circumferential velocity as the shaft of the delivery roller 14, the velocity of the shaft 20 preferably being slightly higher than that of the shaft 14.

Between the pair of feed rollers 2, 9 and the pair of delivery rollers 14, 16, a belt drawing device is arranged which consists of the two endless bands 22, 23. The bearing block 7 on which the pawl is journalled also serves for journalling the belt drawing device. It is removably arranged on a surface 24 of the machine frame. The endless band 22 arranged towards the machine frame is arranged around two rollers 25, 26, whose axle pins 27, 28 are both arranged in the bearing block 7. The outwardly directed endless band 23 is mounted on two rollers 29, 30, of which the roller 29 is journal-led in the bearing block 7 by means of a pin 31. The roller 30, however, is journalled on a long single armed lever 32 which is rotatable about a pin 33 provided in the bearing block 7. This pin 33 serves simultaneously for supporting a thread feeler lever 34 which carries a roller 35 on one side which is influenced inknown manner by the tightened thread 36. The other side of the thread feeler lever engages in a hole (not shown) by means of a pin 37 which is provided in one arm of the pawl 5. In this way, the pawl is influenced in both directions of the movement by the thread feeler lever 34.

Finally, a sledge runner-shaped lever 39 is journalled on the pin 33 and its gently curved surface 40 is caused to lie against the endless band 23 from inside. This lever can be turned by means of a rod 41 which provides the connection between an operating lever 42 and a pin 43, which is provided on that end of the 'lever 39 which is opposite to the pin 33. It is possible in this way to alter the nip point between thetwo endless bands 23, 24 in the lengthwise direction, that is in the direction between their hearing devices.

Finally, a thread guide or a conductor 44 is arranged between the pair of delivery rollers and the pair of twisting rollers 20, 21. It is rotatably provided on a bearing block 45 which is secured to hearing shaft 46 extending over the length of the spinning frame. This thread guide 44 serves, as particularly shown in Fig. 2, to collect the sliver in the transverse direction which has been passed through the pair of delivery rollers 14, 16 still in its full width.

An actuating lever 47, with a cam surface 48 and a lever 49, is arranged on the bearing block 45. One end of a bolt 50 engages the lever 49, and the other end is mounted in the bearing block 45 in a manner not shown in detail. A floating lever 51 is rotatably journalled on this end, and its other end acts on the shaft 52 of the pressure roller 16. The lever 49, however, lies against the shaft 53 and the twisting roller 21 from outside.

In the position shown, the spring 17, which is arranged between the two levers 49 and 51, is extended and presses the pressure roller 16 and also the twisting roller 21 into the position shown against their driving rollers. After knocking down the lever 47, the spring 17 expands so that the pressure roller 16 and the twisting roller 21 become unloaded and can be taken out without difliculty.

The construction of the belt drawing device described operates satisfactorily especially in connection with the thread guide 44 arranged beneath the delivery roller 14 and the pressure roller 16. It is possible in this way to locate the belt drawing device particularly close to the the gripping point of the pair of delivery rollers.

As already described above, in the embodiment on bearing block 7 serves for journalling the belt drawir devices of two spinning units. In a similar manner, ea ch two twisting rollers 21 and two pressure rollers 16 a united into one pair which is pressed down or freed by v separated from the driving shaft 1 by the action of thread feeler lever 34 on thread breakage.

The width of the pressure roller 16 is about the sa. m as that of the endless belts, that is, wider than usual, sine" the sliver is collected in the transverse direction only after' the delivery roller 14 and pressure roller 16 by the thread guide 44.

Having now particularly described and ascertained the nature of my invention and in what manner the same is to be performed, I declare that whatl claim is:

1. In combination with a machine for spinning long leaf fibres of the type having feed rollers, and delivery rollers and including a drawing device disposed between said feed rollers and delivery rollers, a pair of twisting rollers disposed directly adjacent said delivery rollers, the distance between said delivery rollers and said twisting rollers being relatively short as compared to the distance between said feed rollers and said delivery rollers to preclude any appreciable drawing effect between said delivery rollers and said twisting rollers, a driven shaft, at least one of said twisting rollers being positively driven by said driven shaft.

2. In combination with a machine for spinning long leaf fibres of the type having feed rollers and delivery rollers and including a drawing device for a sliver disposed betweensaid feed rollers and delivery rollers, the sliver being presented to and discharged by the delivery rollers in full 'width, a pair of twisting rollers disposed directly adjacent said delivery rollers, the distance between said delivery rollers and said twisting rollers being relatively short as compared to the distance between said feed rollers and said delivery rollers to preclude any appreciable drawing effect between said delivery rollers and said twisting rollers, a transverse collector for the full width sliver disposed between said delivery rollers and said twisting rollers, a driven shaft, at least one of said twisting rollers being positively driven by said driven shaft.

3. Inthe combination of claim 1 including means for driving said twisting rollers at a circumferential speed which is substantially the same as the circumferential speed of said delivery rollers.

4. In a machine for spinning long leaf fibres of the type having feed rollers and delivery rollers and including a drawing device disposed between said feed rollers and delivery rollers, a pair of twisting rollers disposed beneath said delivery rollers, the distance between said delivery rollers and said twisting rollers being appreciably smaller than the distance between said feed rollers and said delivery rollers, whereby to preclude any drawing elfect between the delivery rollers and the said twisting rollers, and means for driving said twisting rollers at a circumferential speed which is substantially the same as the circumferential speed of said delivery rollers, a driven shaft, at least one of said twisting rollers being positively driven by said driven shaft.

5. In a machine for spinning long leaf fibres of the type having feed rollersand delivery rollers and including a drawing device disposed between said feed rollers and delivery rollers, a pair of twisting rollers disposed beneath said delivery rollers, the distance between said delivery rollers and said twisting rollers being appreciably smaller than the distance between said feed rollers 'and said delivery rollers, whereby to preclude any drawing efiect between the delivery rollers and the said twisting rollers, a driven shaft, at least one of said twisting rollers being positively driven by said driven shaft, and actuating means for simultaneously retracting one of said twisting rollers and one of said delivery rollers in an inoperative position.

References Cited in the file of this patent UNITED STATES PATENTS 32,240 Coltman Sept. 14, 1880 

